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Laboratory Techniques

Quick questions on Micropipetting and solution preparation: O-Level Laboratory Techniques

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is using a micropipette?
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A micropipette measures and transfers very small volumes, typically in microlitres. To use one accurately:
What is concentration?
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The concentration of a solution is the amount of solute dissolved in a given volume of solution. A more concentrated solution has more solute per unit volume.
What is q1?
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State two steps that help a micropipette give an accurate volume. [2 marks]
What is q2?
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You need 20 mL20\ \text{mL} of a 0.25 mol dm30.25\ \text{mol dm}^{-3} solution from a 1.0 mol dm31.0\ \text{mol dm}^{-3} stock. Find the volume of stock needed. [2 marks]
What is q3?
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For the solution in Q2, state the volume of water to add. [1 mark]

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